I'm looking for suggestions regarding an easy-to install solution for the following problem:

a) WiFi in an area is by Wireless Access Points (2.4GHz and 5.2GHz) and public in nature - in a way, similar to WiFi at your local coffee shop. Also, it is not password protected nor safe by any means.

b) I have some WIRED devices I want to connect.

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This is similar to a scenario where one wants to take a laptop with non-available USB ports and a broken WiFi adapter, but with working RJ-45 port into the Coffee Shop, connect the laptop to some device that can configured to connect to the Coffee Shop's WiFi Access Point service. Basically a WiFi based bridge

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I'm looking for a hardware solution that can allowany wired device to connect to the WiFi Access Point. I originally purchased a WiFi extender with a built in Ethernet port, but apparently, according to the IT folks running the WiFi in this area, their exact setup won't work with an extender.

My next thought is something like an IOGEAR's Ethernet-2WiFi adapter, which from reading looks like would do the trick, but it is only 2.4GHz.

@jclausius if a router in bridged mode won't work for whatever reason, I'd use some ARM mini pc. How many ethernet ports do you need, and how many of them need be Gigabit? What brands of mini pcs can you source in reasonable time?

If single 10/100M ethernet is acceptable, I'd recommend Orange Pi Zero w/case + 802.11ac 2x2 RTL8812 wi-fi adapter, but depending on your location these may take a while to deliver, or be more expensive than just buying some Raspberry Pi locally.

Worse case, I could put an old PC with a wireless USB (like shown), and make it a plain router. However, a device would be preferable. I'll investigate the Orange Pi + case route. Thanks for the suggestion!!